This is called commander ninjutsu and it appears on Yuriko, the Tiger's Shadow
For example, you choose the value of X for that player's Earthquake, the target for that player's Lightning Bolt, what mana that player spends to cast Day of Judgment, and what card that player gets with Diabolic Tutor
You have to throw the capture dice and hope you catch the Pokmon, or you may use Abilities to affect the process
Overrun Rarity: Uncommon TYPE: Sorcery SUBTYPE: - CMC: 5 Mana cost: USD: $0.35 EUR: 0.46 TIX: 0.04 EDHREC RANK: 1723 Creatures you control get +3/+3 and gain trample until end of turn
Rafael was stranded on a deserted island with only his Duel Monsters, which included "Guardian Eatos", "Guardian Grarl", and "Guardian Kay'est", which he treasured